Removing Duplicates in Lists

[Tim Carter]

I did a search, not a lot came back, so after figuring it out, thought I would share back these two snippets. No doubt they need improving or it has already been done somewhere else.

Remove duplicates for a single list:

Just to make it clear what is happening I sent the output to another list, as opposed to overwriting the original one.

Using a for each block, 

• get the list with duplicates
  
• check if the item is in the new list
• if it isn't add it to the list
• if it is, don't add it to the list
• tidy up

Compare Two Lists and Remove Duplicates before Combining:

removes duplicates from the second list by checking each item from the first, then combines the two lists to a new list.